Method of forming concrete structural units



comma 0B PLASTlC Cross Reference Examiner Oct. 6, 1931. A. E. SCHUTTE1,326,529

NETHOD OF FORMING CONCRETE STRUCTURAL UNITS Filed ma 16. 1929 $5M, 3mm 5much-MM; a. 5mm 33%! Patented Oct. 6, 1931 XP UNITED STATES ATENT OFFICEAUGUST E. SCHUTTE, 91F NOBTHBOBO, MASSACHUSETTS, ASSIGNOR TO I WARRENBROTHERS COMPANY, A CORPORATION 01' WEST V'IBGINLA v IETHOD OI FORMINGCONCRETE STBUUI'URAL UI VITS Application fled Kay 18,

This invention relates to method of pro-.' ducing concrete structuralunits such as piles, retaining walls and the like, and particularly tosuch units where protection against the 5 destructive action of seawater is essential.

In a co nding application, Serial No. 259,- 931, file March 7, 1928,which has become Patent No. 1,788,748, there is described the use of aprotective coating consisting of ydraulic cement out, a ta-ted in aheated condition with asphalt, is coating is app plied and allowed toset, after which it is eated to diffuse the asphalt which initially isin the form of dispersed nodules or particles.

The present invention is based on a somewhat similar procedure,effective to disperse asphalt throughout a concrete structural unit.

The invention will be described in connection with the accompanyingdrawings, in

which Figure 1 is a view, partly in vertical section, of a wall or pileconstructed according to my invention; Figure 2 is a diagramillustrating the condition prior to di usion of the asphalt" by heating;

Figure 3 is a similar view after such difr il a b h fh d 1 ere isprepare a ate 0 ran ic cement concrete containing cemen san crus e stone(or vel and water. TEE components may be conveniently lieaed beforemixin -or the batch may ab hduring or a%r mixing, so that thetemperature of the batch is at least as high as the melting temperatureof the asphalt to be used. A suitable uality of a alt heated to aboutthe same t emperatu're is then added to the concrete and m xed therewithby agitation' until the asphalt is dispgrsed '13 lfine nodules orarticles uniform y t rou on the mass. 'lllianges in temperatures? "theduratifi'bf a 'tation affect the fineness of the dispersed asp altparticles and considerable latitude is permissible according to thefinal results desired.

The concrete thus formed is then allowed to set in forms. If thestructural units to be produced are of uniform section, and not toomasses of 1929. Serial R0. 883,506. 2 Y J 3'' large ordinary practice isfollowed, but if the SBCUOIIS. are irregular or large, so that uniformdistribution of heat is impracticable without danger of differentialheating and cracking one or more heat convector passages are formed inthe unit and so spaced that the distribution of heat thereby will besubstantially uniform throughout the unit.

In Figure 1 there is shown at 6 a passage of this character, extendingaxially through a ile 7. In the case of a wall or slab of similarthickness there would be a series of equally spaced parallel passagescentered on the median plane of the wall.

After the concrete has set the asphalt will be found in fine dispersednodules of particles 8 as illustrated in a somewhat exaggerated scale inFi res 1 and 2. After the concrete is set, t e entire ma'ss of the unitis heated by a medium applied exte'rnall and through the wages described(if anyl the tem rature in sufiicient to fuse the ash t nodules antocause the same to difse through the porous structure of the driedconcrete and to coalesce. I Figure 3 there are illustrated a pluralityof areas 9 in which the asphalt has diffused from the pockets in whichthe asphalt nodules were originally contained. The illustration is to anextent diagrammatic and is not recise.

Considerable latitude in proportions and iii the1 order and degree ofheating is contemp ate What is claimed is:

1. 'The method of forming structural units which comprises, preparing anordinary cement concrete contaimng aggregate, hydraulic cement andwater; heating said concrete before it sets; heatin asphalt; mixing theheatedasphalt with t a heated concrete and agitating the mixture untilthe asphalt'is thoroughly dispersed in the form of fine masses; allowingthe resulting mixture to set in the form of a-structural unit; andfinally heatin said unit to cause the dispersed aspialt to difiuse andcoalesce.

2. The method of forming structural units which comprises preparing aheated batch of concrete containing aggregate, hydrauliccem ment, waterand asphalt; agitatin the same to ensure dispersion of the aspha t insmall allowing the concrete to set in the form of a structural unithaving at least one 8 core pass arranged to permit substantially uniformistribution o heating medium throughout the mass of said unit; andfinally heating said unit by a heating medium distributed thereby andthus causing the dis- 1o persed masses of asphalt to difiuse andcoalesce.

3. The method of forming structural units which comprises, preparing anordina cement concrete contaimng aggregate, hy rauj lic cement andwater; heatin said concrete before it sets; heatin aspha t; mixing theheated asphalt with t e heated concrete and agitatin themixture' untilthe asphalt is oroug 1y dispersed in the form of fine a masses; a owingthe resulting mixture to set in the form of a structural unit having atleast one core passage arranged to permit substantially unlformdistribution of heating medium throughout the mass of said unit; ,5 andfinally heatin said unit b a heating medium distribute thereby an thuscausing the dispersed masses of asphalt to diffuse and coalesce.

In testimony whereof I have signed my a name to this specification.

AUGUST E. SCHUTTE.

